Lens distance is basically the distance from the lens to the film. This is determined when the lens is focused to infinity and is sometimes called the focal length.
If the lens are thicker it affects the image distance.
If 'f' is the focal length of the lens, and 'o' is the distance between the lens and the object, then the distance between the lens and the image is: ('f' times 'o') divided by ('o' minus 'f')
The focal length of a lens is the distance from the principal foci to the center of the lens.
If the lens are thicker it affects the image distance.
Easy way: Use it to form an image of the sun or moon, and measure the distance of the image behind the lens. When the object is at infinity, the distance between the lens and the image is the focal length of the lens.
The distance from the center of a lens to one of its focal points is the focal length of the lens.
If the lens are thicker it affects the image distance.
If 'f' is the focal length of the lens, and 'o' is the distance between the lens and the object, then the distance between the lens and the image is: ('f' times 'o') divided by ('o' minus 'f')
That's a tough question to answer when it comes to Camera Lens', but put it this way: a 55mm lens is the "normal" distance. So if you take a picture of a tree with a 55mm lens, it captures pretty much what you see with your own eyes, now if you use a 200mm lens, you can see the same shot if you were 4x the distance than you were with the first shot with the 55mm lens. So with a 400mm lens, you can see the same shot if you're 8x the distance, 600mm will be 16x the distance, and 800mm will be 32x the distance. So that should Kinda give you an idea as to how you can see with that lens. Hope this helped!!
It is 66 Miles from Calais to Lens
The focal length of a lens is the distance from the principal foci to the center of the lens.
The distance from the centre of the lens to the focal point.
If the lens are thicker it affects the image distance.
Easy way: Use it to form an image of the sun or moon, and measure the distance of the image behind the lens. When the object is at infinity, the distance between the lens and the image is the focal length of the lens.
1/(focal length) = 1/(distance of object) + 1/(distance of image) is the formula for calculating x of a lens knowing only the focal length which is the distance from the lens to the image of sun formed by it.
c virtual,upright,and larger than the object.
the distance between the specimen and the objective lens